Why my IU number is still tag with my old carplate number and not my new bidden number?

Hi Ingnesius Jiselle Lee, thank you for your question. You can use this link to update your IU number in 4 steps: https://www.ura.gov.sg/Update-Season-Parking-In-Veh-Unit-No/view

For more info you can visit here: https://www.ura.gov.sg/Corporate/Car-Parks/Season-Parking/Transfer